The Primal Law (1921) is a Action, Drama, Romance film that follows silent cowboy western starring Dustin Farnum as a rancher whose partner is killed by rustlers. He takes in his partner's young son, and begins to sell his ranch, but the boy finds oil on the land. The Primal Law is not currently listed with streaming providers in your selected region, but availability can change over time. It has a user rating of 10.0 out of 10 from 1 votes. Fans of action movies may also want to explore similar titles below.